quirk

A quirk is a funny or unusual habit that someone has.

When we talk about quirks, we usually mean something peculiar or offbeat about a person's personality or behavior. For example, if your friend always eats their cereal with chopsticks, you might say they have a quirky eating habit. Quirks can be small things, like having a favorite way of folding your socks or always taking the same route to work. They're not necessarily bad, but they are often amusing or unexpected. Sometimes people use "quirk" in relation to objects too - for example, an old car might have some quirky features that make it unique. But overall, quirks are just the interesting little things that make each person special.